Plastic fillings
• The material is soft, it is cured (set) in the
cavity _ amalgam, composite, glassionomer,
temporaries.
Rigid fillings - inlays
• The material is rigid (already cured)
Metal alloy, composite, ceramics.
Inlays
• Rigid fillings
• Manufactured in a dental lab
• Direct or indirect method
- Direct method rarely
- Indirect method most common
Inlay
• Crown inlay
- a part of a clinical crown is replaced
• Root canal inlay
- The inlay is cemented into the root canal and
replaces a crown (abutment tooth – stump,
snag)
Crown inlay
Material
Composit
Ceramics
Metal Alloys
Crown inlays
Indications
A big lost of dental tissues
Next to the crowns and bridges made of metal
alloy
Crown inlays
Contra - indication
1. Too small - shallow (flat) cavities
2. High caries risk
3. Frontal area (metallic)
Basic rules of preparation
Box
No undercuts
Light divergence of the walls (facilitating
shape). Angle of divergency 6 – 15°
Box
No undercuts
Simple box
Facilitating form
Inlay of metal alloy
• Direct method
• Indirect method
Inlay of metal alloy
Direct method
Direct modellation in the mouth
Special wax – casting wax,
(special polymers)
Sprue pin
Investment
Method of the lost wax
Class I.
All fissures are involved
No undercuts – facilitating form
Asymetric outlines
Depth 1,5 mm
Sequence of operations
Dental office
- Preparation
- Isolation of the cavity
- Modellation of heated casting wax
- Sprue pin – the thickest part,reservoir
Dental lab
- Investment
- Casting (method of lost wax)
-Finishing
Dental office
- Cementation
Inlay of metal alloy
Indirect method
Taking of the impression
Model
Modellation of the casting wax,
(special polymers)
Sprue pin
Investment
Lost wax method